第一题(选择题)两题:1.使(ax²-2xy+y²)-(-ax²+bxy+2y²)=6x²-9xy+cy²成立的a,b,c依次是( )A.3,-7,-1 B.-3,7,-1 C.3,7,-1 D.-3,-7,12.若一个长方形能够折叠成一个所有棱长均相等的六
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![第一题(选择题)两题:1.使(ax²-2xy+y²)-(-ax²+bxy+2y²)=6x²-9xy+cy²成立的a,b,c依次是( )A.3,-7,-1 B.-3,7,-1 C.3,7,-1 D.-3,-7,12.若一个长方形能够折叠成一个所有棱长均相等的六](/uploads/image/z/2681244-36-4.jpg?t=%E7%AC%AC%E4%B8%80%E9%A2%98%EF%BC%88%E9%80%89%E6%8B%A9%E9%A2%98%EF%BC%89%E4%B8%A4%E9%A2%98%EF%BC%9A1.%E4%BD%BF%EF%BC%88ax%26sup2%3B-2xy%2By%26sup2%3B%EF%BC%89-%EF%BC%88-ax%26sup2%3B%2Bbxy%2B2y%26sup2%3B%29%3D6x%26sup2%3B-9xy%2Bcy%26sup2%3B%E6%88%90%E7%AB%8B%E7%9A%84a%2Cb%2Cc%E4%BE%9D%E6%AC%A1%E6%98%AF%EF%BC%88+%EF%BC%89A.3%2C-7%2C-1+B.-3%2C7%2C-1+C.3%2C7%2C-1+D.-3%2C-7%2C12.%E8%8B%A5%E4%B8%80%E4%B8%AA%E9%95%BF%E6%96%B9%E5%BD%A2%E8%83%BD%E5%A4%9F%E6%8A%98%E5%8F%A0%E6%88%90%E4%B8%80%E4%B8%AA%E6%89%80%E6%9C%89%E6%A3%B1%E9%95%BF%E5%9D%87%E7%9B%B8%E7%AD%89%E7%9A%84%E5%85%AD)
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